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Besides a gasser, I also drive an F-250 6.0 PSD. Had a 7.3 when Diesel #2 was heavier and only cost a buck. Nowadays, the fuel looks lighter, smells lighter, and (on ULSD) my conservative driving is yielding -2 MPG in combo L.A. freeway driving. Most of us Diesel folk use an additive like...

In the old days of gas engine and gasoline technology, more power was teased out of gasoline by advancing engine timing, and using premium gas (with Tetra Ethyl Lead) as a flame-front moderator, so the charge burned through more of the down stroke - instead of exploding at the top of the...